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Prothena (PRTA) Institutional Ownership

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$10.66 +0.54 (+5.34%)
Closing price 04:00 PM Eastern
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$10.76 +0.10 (+0.89%)
As of 07:09 PM Eastern
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Institutional Ownership Changes (13F Filings) for Prothena (NASDAQ:PRTA)

Current
Institutional Ownership
Percentage
97.08%
Number of
Institutional Buyers
(last 12 months)
93
Total
Institutional Inflows
(last 12 months)
$126.47M
Number of
Institutional Sellers
(last 12 months)
42
Total
Institutional Outflows
(last 12 months)
$46.25M
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PRTA Institutional Buying and Selling by Quarter

Prothena Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
10/15/2025CWM LLC10,246$100K0.0%+650.1%0.019%
10/10/2025 Focused Wealth Management Inc57,129$558K0.1%+77.8%0.106%
10/7/2025 Assenagon Asset Management S.A.89,704$876K0.0%N/A0.167%
8/27/2025Squarepoint Ops LLC209,249$1.27M0.0%N/A0.389%
8/15/2025Tower Research Capital LLC TRC 12,709$77K0.0%+571.0%0.024%
8/15/2025Monimus Capital Management LP206,475$1.25M0.9%N/A0.384%
8/15/2025Voleon Capital Management LP18,536$113K0.0%N/A0.034%
8/15/2025Rangeley Capital LLC715,367$4.34M5.4%N/A1.329%
8/15/2025Man Group plc42,752$260K0.0%+151.5%0.079%
8/15/2025Engineers Gate Manager LP40,967$249K0.0%N/A0.076%
8/15/2025BNP Paribas Financial Markets46,844$284K0.0%+389.1%0.087%
8/15/2025Birchview Capital LP451,019$2.74M2.7%+35.5%0.838%
8/15/2025Balyasny Asset Management L.P.575,792$3.50M0.0%N/A1.070%
8/15/2025Bank of America Corp DE210,945$1.28M0.0%+59.8%0.392%
8/15/2025Ameriprise Financial Inc.151,543$920K0.0%N/A0.282%
8/14/2025PDT Partners LLC41,281$251K0.0%-72.5%0.077%
8/14/2025Quantinno Capital Management LP59,618$362K0.0%N/A0.111%
8/14/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.21,218$129K0.0%-22.4%0.039%
8/14/2025Armistice Capital LLC2,236,000$13.57M0.2%+1.8%4.154%
8/14/2025The Manufacturers Life Insurance Company 15,140$92K0.0%-76.8%0.028%
8/14/2025Squarepoint Ops LLC209,249$1.27M0.0%N/A0.389%
8/14/2025Nebula Research & Development LLC22,857$139K0.0%N/A0.042%
8/14/2025Qube Research & Technologies Ltd414,828$2.52M0.0%N/A0.771%
8/14/2025Federated Hermes Inc.1,181,087$7.17M0.0%+116.2%2.194%
8/13/2025Cresset Asset Management LLC10,314$63K0.0%-21.4%0.019%
8/13/2025New York State Common Retirement Fund8,979$55K0.0%-37.1%0.017%
8/13/2025Virtus Investment Advisers LLC18,547$113K0.0%+56.0%0.034%
8/13/2025Norges Bank57,454$349K0.0%N/A0.107%
8/13/2025Quadrature Capital Ltd23,752$144K0.0%N/A0.044%
8/13/2025Hsbc Holdings PLC46,047$282K0.0%+251.8%0.086%
8/13/2025Russell Investments Group Ltd.96,196$584K0.0%+7,956.6%0.179%
8/12/2025DCF Advisers LLC156,500$950K0.4%-19.7%0.291%
8/12/2025American Century Companies Inc.59,965$364K0.0%+72.1%0.111%
8/12/2025Rhumbline Advisers63,005$382K0.0%-4.7%0.117%
8/12/2025Franklin Resources Inc.56,078$340K0.0%+184.0%0.104%
8/12/2025Legal & General Group Plc9,323$57K0.0%-77.5%0.017%
8/12/2025JPMorgan Chase & Co.126,951$771K0.0%-65.9%0.236%
8/12/2025Swiss National Bank56,500$343K0.0%-17.8%0.105%
8/8/2025Intech Investment Management LLC18,374$112K0.0%-44.9%0.034%
8/8/2025Creative Planning50,569$307K0.0%+373.0%0.094%
8/8/2025SG Americas Securities LLC51,941$315K0.0%-28.4%0.096%
8/8/2025Geode Capital Management LLC933,446$5.67M0.0%-8.0%1.734%
8/8/2025PNC Financial Services Group Inc.18,028$109K0.0%+3,594.3%0.033%
8/8/2025Quinn Opportunity Partners LLC50,000$304K0.0%N/A0.093%
8/7/2025Monaco Asset Management SAM70,000$425K0.1%N/A0.130%
8/7/2025Acadian Asset Management LLC1,018,177$6.18M0.0%N/A1.891%
8/7/2025Connor Clark & Lunn Investment Management Ltd.18,896$115K0.0%-79.3%0.035%
8/7/2025Los Angeles Capital Management LLC16,702$101K0.0%N/A0.031%
8/6/2025Prospera Financial Services Inc10,000$61K0.0%N/A0.019%
8/5/2025Corton Capital Inc.13,964$85K0.1%N/A0.026%
8/1/2025Purkiss Capital Advisors LLC24,904$151K0.1%+15.1%0.046%
7/29/2025Nordea Investment Management AB311,605$1.92M0.0%+1.2%0.579%
7/15/2025Public Employees Retirement System of Ohio42,158$256K0.0%N/A0.078%
7/10/2025Mogy Joel R Investment Counsel Inc.20,750$126K0.0%N/A0.039%
6/27/2025Goldman Sachs Group Inc.510,462$6.32M0.0%-8.3%0.948%
5/23/2025Siren L.L.C.1,283,555$15.88M0.9%+16.7%2.385%
5/16/2025Goldman Sachs Group Inc.510,462$6.32M0.0%-8.3%0.948%
5/16/2025Jacobs Levy Equity Management Inc.18,553$230K0.0%N/A0.034%
5/15/2025Birchview Capital LP332,974$4.12M3.5%+9.3%0.619%
5/15/2025Palo Alto Investors LP1,659,734$20.54M3.9%-4.5%3.083%
5/15/2025PDT Partners LLC150,316$1.86M0.1%+18.2%0.279%
5/15/2025Armistice Capital LLC2,196,000$27.18M0.4%-1.8%4.080%
5/15/2025Siren L.L.C.1,283,555$15.88M0.9%+16.7%2.385%
5/14/2025Rafferty Asset Management LLC43,978$544K0.0%-43.4%0.082%
5/14/2025Price T Rowe Associates Inc. MD3,455,856$42.77M0.0%-6.2%6.420%
5/14/2025Hsbc Holdings PLC13,088$160K0.0%-45.9%0.024%
5/14/2025Wellington Management Group LLP5,199,528$64.34M0.0%+1.3%9.660%
5/13/2025Cresset Asset Management LLC13,125$162K0.0%-32.5%0.024%
5/13/2025American Century Companies Inc.34,836$431K0.0%+14.6%0.065%
5/12/2025Nuveen LLC149,961$1.86M0.0%N/A0.279%
5/12/2025Invesco Ltd.37,638$466K0.0%-12.2%0.070%
5/9/2025Chicago Partners Investment Group LLC14,512$180K0.0%+29.6%0.027%
5/9/2025Charles Schwab Investment Management Inc.319,607$3.96M0.0%-2.3%0.594%
5/9/2025DCF Advisers LLC195,000$2.41M1.2%+88.4%0.362%
5/8/2025Federated Hermes Inc.546,255$6.76M0.0%-26.8%1.015%
5/7/2025Purkiss Capital Advisors LLC21,629$268K0.2%+101.6%0.040%
5/7/2025TD Asset Management Inc62,694$776K0.0%-3.1%0.116%
5/6/2025Pinnacle Associates Ltd.100,259$1.24M0.0%-2.7%0.186%
5/6/2025KLP Kapitalforvaltning AS6,700$83K0.0%-48.1%0.012%
4/30/2025Alps Advisors Inc.37,956$470K0.0%-12.8%0.071%
4/29/2025Bank of New York Mellon Corp146,009$1.81M0.0%-2.8%0.271%
4/24/2025HighMark Wealth Management LLC2,018$25K0.0%-81.9%0.004%
4/22/2025Cambridge Investment Research Advisors Inc.10,164$126K0.0%N/A0.019%
4/21/2025Duncan Williams Asset Management LLC88,339$1.09M0.4%+27.7%0.164%
4/15/2025SG Americas Securities LLC72,559$898K0.0%+92.9%0.135%
4/10/2025Hennion & Walsh Asset Management Inc.77,637$961K0.0%+48.5%0.144%
4/8/2025Rhumbline Advisers66,079$818K0.0%-1.5%0.123%
4/7/2025GAMMA Investing LLC6,002$74K0.0%+4,626.0%0.011%
3/24/2025Wellington Management Group LLP5,130,876$71.06M0.0%+22.8%9.532%
2/17/2025UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC381,508$5.28M0.0%-27.6%0.709%
2/17/2025Two Sigma Investments LP38,394$532K0.0%+265.4%0.071%
2/17/2025Rafferty Asset Management LLC77,672$1.08M0.0%+24.8%0.144%
2/17/2025ProShare Advisors LLC14,524$201K0.0%+29.5%0.027%
2/17/2025Prosight Management LP418,122$5.79M1.6%-13.5%0.777%
2/17/2025Man Group plc77,430$1.07M0.0%+90.7%0.144%
2/17/2025Millennium Management LLC123,005$1.70M0.0%+9.3%0.229%
2/17/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.27,269$381K0.0%+6.0%0.051%
2/17/2025Deutsche Bank AG95,970$1.33M0.0%+195.7%0.178%
2/17/2025Cresset Asset Management LLC19,434$269K0.0%-20.4%0.036%
2/17/2025Cary Street Partners Financial LLC12,500$173K0.0%N/A0.023%
(Data available from 1/1/2016 forward)

PRTA Institutional Ownership - Frequently Asked Questions

Who are the largest shareholders of PRTA shares?

During the previous two years, 156 institutional investors and hedge funds held shares of Prothena. The most heavily invested institutionals were FMR LLC ($111.79M), Wellington Management Group LLP ($64.34M), Price T Rowe Associates Inc. MD ($42.77M), State Street Corp ($28.02M), Artal Group S.A. ($24.80M), Boxer Capital LLC ($24.17M), and Palo Alto Investors LP ($20.54M).Learn more on Prothena's institutional investors.

What percentage of Prothena's stock is owned by institutional investors?

97.08% of Prothena's stock is owned by institutional investors. Learn more on PRTA's institutional investor holdings.

Which institutional investors have been buying Prothena's stock?

Of the 130 institutional investors that purchased Prothena's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Wellington Management Group LLP ($2.96M), Federated Hermes Inc. ($1.02M), Acadian Asset Management LLC ($1.02M), Armistice Capital LLC ($782K), Rangeley Capital LLC ($715.37K), Boxer Capital Management LLC ($690K), and Balyasny Asset Management L.P. ($613.81K).

How much institutional buying is happening at Prothena?

Institutional investors have bought a total of 11,893,731 shares in the last 24 months. This purchase volume represents approximately $126.47M in transactions.

Which of Prothena's major shareholders have been selling company stock?

Of the 42 institutional investors that sold Prothena's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Janus Henderson Group PLC ($1.01M), Price T Rowe Associates Inc. MD ($366.58K), JPMorgan Chase & Co. ($340.99K), State Street Corp ($257.56K), Federated Hermes Inc. ($199.92K), Systematic Financial Management LP ($185.64K), and UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($145.24K).

How much institutional selling is happening at Prothena?

Institutional investors have sold a total of 3,477,227 shares in the last 24 months. This volume of shares sold represents approximately $46.25M in transactions.


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This page (NASDAQ:PRTA) was last updated on 10/15/2025 by MarketBeat.com Staff
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